The nodal beam is not part of the drivetrain
Got it. I was interpreting "L4 drivetrain" in the broadest sense. I am familiar with the Frahm damper as a result of flying the B407 for awhile. Smooth, fast, quiet (relatively speaking)! My standard of reference for a light single helo. If the 505 comes anywhere close in terms of ride quality, likely to be a big winner for Bell.